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Annotation of embedaddon/php/win32/flock.c, revision 1.1

1.1     ! misho       1: /*
        !             2:  * Program:   Unix compatibility routines
        !             3:  *
        !             4:  * Author:  Mark Crispin
        !             5:  *      Networks and Distributed Computing
        !             6:  *      Computing & Communications
        !             7:  *      University of Washington
        !             8:  *      Administration Building, AG-44
        !             9:  *      Seattle, WA  98195
        !            10:  *      Internet: MRC@CAC.Washington.EDU
        !            11:  *
        !            12:  * Date:    14 September 1996
        !            13:  * Last Edited: 14 August 1997
        !            14:  *
        !            15:  * Copyright 1997 by the University of Washington
        !            16:  *
        !            17:  *  Permission to use, copy, modify, and distribute this software and its
        !            18:  * documentation for any purpose and without fee is hereby granted, provided
        !            19:  * that the above copyright notice appears in all copies and that both the
        !            20:  * above copyright notice and this permission notice appear in supporting
        !            21:  * documentation, and that the name of the University of Washington not be
        !            22:  * used in advertising or publicity pertaining to distribution of the software
        !            23:  * without specific, written prior permission.  This software is made available
        !            24:  * "as is", and
        !            25:  * THE UNIVERSITY OF WASHINGTON DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED,
        !            26:  * WITH REGARD TO THIS SOFTWARE, INCLUDING WITHOUT LIMITATION ALL IMPLIED
        !            27:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, AND IN
        !            28:  * NO EVENT SHALL THE UNIVERSITY OF WASHINGTON BE LIABLE FOR ANY SPECIAL,
        !            29:  * INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
        !            30:  * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, TORT
        !            31:  * (INCLUDING NEGLIGENCE) OR STRICT LIABILITY, ARISING OUT OF OR IN CONNECTION
        !            32:  * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
        !            33:  *
        !            34:  */
        !            35: 
        !            36: 
        !            37: /*              DEDICATION
        !            38: 
        !            39:  *  This file is dedicated to my dog, Unix, also known as Yun-chan and
        !            40:  * Unix J. Terwilliker Jehosophat Aloysius Monstrosity Animal Beast.  Unix
        !            41:  * passed away at the age of 11 1/2 on September 14, 1996, 12:18 PM PDT, after
        !            42:  * a two-month bout with cirrhosis of the liver.
        !            43:  *
        !            44:  *  He was a dear friend, and I miss him terribly.
        !            45:  *
        !            46:  *  Lift a leg, Yunie.  Luv ya forever!!!!
        !            47:  */
        !            48: 
        !            49: #include "php.h"
        !            50: #include <windows.h>
        !            51: #include <io.h>
        !            52: #include <errno.h>
        !            53: #include "flock.h"
        !            54: 
        !            55: PHPAPI int flock(int fd, int op)
        !            56: {
        !            57:        HANDLE hdl = (HANDLE) _get_osfhandle(fd);
        !            58:        DWORD low = 1, high = 0;
        !            59:        OVERLAPPED offset =
        !            60:        {0, 0, 0, 0, NULL};
        !            61:        if (hdl < 0)
        !            62:                return -1;                              /* error in file descriptor */
        !            63:        /* bug for bug compatible with Unix */
        !            64:        UnlockFileEx(hdl, 0, low, high, &offset);
        !            65:        switch (op & ~LOCK_NB) {        /* translate to LockFileEx() op */
        !            66:                case LOCK_EX:                   /* exclusive */
        !            67:                        if (LockFileEx(hdl, LOCKFILE_EXCLUSIVE_LOCK +
        !            68:                                                ((op & LOCK_NB) ? LOCKFILE_FAIL_IMMEDIATELY : 0),
        !            69:                                                   0, low, high, &offset))
        !            70:                                return 0;
        !            71:                        break;
        !            72:                case LOCK_SH:                   /* shared */
        !            73:                        if (LockFileEx(hdl, ((op & LOCK_NB) ? LOCKFILE_FAIL_IMMEDIATELY : 0),
        !            74:                                                   0, low, high, &offset))
        !            75:                                return 0;
        !            76:                        break;
        !            77:                case LOCK_UN:                   /* unlock */
        !            78:                        return 0;                       /* always succeeds */
        !            79:                default:                                /* default */
        !            80:                        break;
        !            81:        }
        !            82:        errno = EINVAL;                         /* bad call */
        !            83:        return -1;
        !            84: }